Dan Ardent

Hello, I am a UK resident selling a property overseas. The total sale price is £70k - i.e. over the £50k limit for reporting but there are substantial costs and the property is also shared 4 ways. The gain on the property after costs is less than the £3k annual exemption. Could you clarify the following: Is the £50,000 limit per person or per property? Is the £50,000 before deductions for costs? If the limit is on a per person basis, then the sale will be less than £50k and the gain is within the allowance, do I need to declare it on my self assessment return (I am registered for self assessment)? Many thanks in advance. Dan